Truck mixer



March 24, 1931. 1` F RQBB 1,797,242

TRUCK MIXER Filed sept. 16. 1929 3 sheets-Sheet `1 I WMM March 24, 1931.

J. F. ROBB TRUCK MIXER l Filed lSept. 16. 1929 3 Sheets-Sheet 2 gru/wanton March 24, 1931. J, F, ROBE 1,797,242

TRUCK MIXER Filed Sept. 16. 1929 3 Sheets-Sheet 3 Patented Mar. 24, 1931 lUNITED STATES PATENT OFFICE JOHN F. BOBB, OF CLEVELAND HEIGHTS, OHIO,l ASSIGNOR T KOEHRING COMPANY,

` 0F MILWAUKEE, WISCONSIN. A CORPORATION t TRUCK MIXER Application filed September 16, 1929. Serial No. 392,861.

Various mixers have been designed in the past few years for mixing concrete on a vehicle while the same is en route to a job. In order to discharge the .mixed concrete at the place where it is to be used, the receptacle is generally provided with tilting means or conveying means to accomplish such discharge of the mixed' aggregates. This discharge us- -.nally takes place at an appreciable height 1o -above the ground, necessitating the use of a lchute in order to brake the fall of the aggregates.

` One of the objects of the instant invention is the provision of a receptacle for mixing concrete while transporting the same to its point of use, said receptacle having novel tilting means associated therewith whereby the discharge point of the'aggregates therew from may be brought as low as desired, even below the level of the surface upon which the vehicle is standing.

In carrying out my invention, I mount any suitable type of receptacle upon a truck body, the receptacle having a discharge opening in its rear wall. Novel means in the form of a rack and pinion are provided for moving the rear end of the receptacle back over the rear of the truck while at the same time the front end of the receptacle is raised. This results 3o in a sliding and tilting movement, whereby the discharge opening may be brought as close to the ground as desired.

A further objectvof my invention is the provision of novel means for bringing about this sliding and tilting motion, said means being self-sustaining for holding the receptacle in any of its intermediate positions.

A further object of the invention is the provision of novel means whereby the contents of the receptacle may be agitated or mixed regardless of the position of the receptacle, said means being driven by a device locatedntrhe vehicle, preferably the propelling mea for the same.

Further and mo es detai'led objects and advantages will in partbecome apparent and in part be hereinafter stated in the followin description and appended claims.

For a full yand'more complete understanding ofthainvention, reference maybe had to the-following description and accompany ing drawings, in which- Figure 1 is a view in side elevation Vof one embodiment of my invention.

Figure 2 is an end view with parts in sec- 55 tion, taken about on the line 2-2 of Figure 1.

Figure 3 is a sectional view taken about on the line 3-3 of Figure 2.

Figure 4 is a view similar to Figure 3, but looking in the opposite direction, and is taken e0 about on the line 4 4 of Figure 2.

Figure 5 is a diagrammatic'showing of two of1 the positions which my receptacle may taxe.

While a preferred, specific embodiment of e5 the invention is herein set forth, it is to be understood that I am not to be limited to the exact constructions illustrated and'described,

because various modifications of these details `may be provided bringing the invention within the purview of the appended claims.

. Throughout the following descriptionand various figures of the drawings, like reference characters denote corresponding parts. In the drawings any vdesirable type of -trufck A having frame members l is provided `neath the drum 2 are racks 9 having the teeth thereof on the underside. 9o

The rear end of the frame l of the vehicle A is provided with openings through which a shaft l0 extends, said shaft having secured thereto pinions 11 which engage the teeth of the racks 9 and support the rearmost portion of the drum 2 and'its associated parts. Iny the position shown in Figure l the forward part of the framework 7 rests upon the cross piece shown at l2, thereby holding the drum 2 in its horizontal position. A worm gear 100 13, also secured to the shaft 10, meshes with a worm 14 secured to the shaft 15 which i-s driven by the motor of the truck or vehicle A. A suitable transmission and operating lever 16 therefor are associated with the shaft 15 for controlling the rotation thereof. A shaft 17 is rotatably mounted on the frame 1.at some point intermediate its length. Secured to the shaft 17 are arms 18, the other ends of which are pivotally connected to the racks 9 as shown at 19. It can readily be seenthat rotation of the pinions 11 causes movement of the drum 2 longitudinally of the truck A, which longitudinal movement is accompanied bya raising of the forward end of the drum by reason of the pivotally mounted arms 18.

In order to make the drum self-sustaining in any of its positions, and also to cause the arms 18 to actively contribute to the lifting of the drum, the shaft 17 is provided with a worm gear 20 which meshes with the worm 21 on a shaft 22. The shaft 22 is driven by shaft 10 through a pair of bevel gears denoted 23. Rotation of shaft 10 causes a corresponding rotation of the shaft 17 through the train of gears as above described, rotation of shaft 17 in turn causing movement of the arms 18. The worms 14 and 21 and their corresponding worm gears 13 and 20 make it impossible for the drum 2 to return to its horizontal position under its own weight. Movement of the drum 2 in either direction must be accomplished by proper rotation of the shaft 15.

To prevent disengagement of the racks 9 from the pinions 11, brackets 24 are rotatably mounted on the shaft 10, which brackets in turn carry rollers 25 which bear against the upper surface of the framework 7.

The shaft 17 has a double sprocket 26 loose thereon, and a shaft 27 passing through the pivotal point 19 has a single sprocket 28 mounted thereon. One part of the double sprocket 26 is connected to the sprocket 28 by means of a chain 29, while the other part of the -sprocket 26 is connected to a similar sprocket 30 by means of the chain 31. The sprocket 30 may be driven as desired by proper manipulation of the transmission lever 16. A worm gear 32 secured to the shaft 27 engages a ring gear 33 on the mixer drum 2.

The operation of the device is as follows The drum 2 is filled with the proper aggregates and water for forming the batch of concrete. The transmission. lever 16 is then moved in the proper position to cause driving of the sprocket 30 which in turn causes rotation of the drum 33 by means of the chain 31, double sprocket 26, sprocket 28, shaft 27, and worm 32. Since the sprockets 26 and 28 are mounted in alignment with the pivotal points of the arms 18, the distance between these sprockets will always be the same and driving of the drum maybe maintained during movementof the same as well as when it is in a horizontal position. When the place the same in which the concrete is to be used is reached, the lever 16 is positioned so as to drive both the sprocket 30 and the shaft 15, whereupon the drum continues rotating as it is lifted and slid backwardly upon the truck A. When the discharge opening 5 of the drum has reached the proper level, the lever 16 maybe once more shifted so that raising of the drum discontinues, but rotation thereof does not stop. As has been before pointed out, the drum will be self-sustaining in any of its raised positions. After the concrete has been discharged, proper manipulation of the lever 16 will once more bring the drum to the position shown in Figure 1 and discontinue rotation of the same.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is-

1. A truck mixer of the class described, comprising, in combination, a vehicle, a mixing drum mounted on the vehicle for receiving aggregates, means for tiltably and slidablymoving said drum in respect to said vehicle, whereby said aggregates may be discharged, and means for rot-ating said druml to mix, said aggregates, said means being operatively connected to a driving means located on the vehicle and operable during tilting and sliding movements of said drum.

2. A truck mixer of the class described, comprising, in combination, a vehicle, propelling means therefor, a mixing drum mounted on the vehicle for receiving aggregates therein, means for tiltably and slidably moving said drum' in respect to said vehicle, said means being operatively connected with the propelling means, and means also operatively connected with said propelling means for rotating said drum to mix said aggregates, said rotating means being operable during the sliding and tilting movements of said receptacle.

3. A truck r n ixer of the class described, comprising, in combination, a vehicle, a mix-l ing drum rotatably mounted thereon, said mixing drum also being tiltable and slidable in respect to said vehicle, means for tilting and slidin said drum, means for rotating uring tilting and sliding move- 115 ments thereof, and a driving device for said rotating means, said device being located on said vehicle.

4. A truck mixer of the class described, comprising, in combination, a vehicle, a receptacle mounted thereon and having a discharge opening, and means for simultaneously slidably, tiltably, and rotatabl moving said receptacle in respect to sai vehicle whereby the contents of said receptacle may be completely discharged. v

5. A truck mixer of the class described, comprising, in combination, a vehicle, a mixing drum, a rack secured to saidndrum, a pinion mounted on saidvehicle andgengaging means .to rotatethe drum. y

7. A truck mixer of the, class described, comprising, in combination, a vehicle, a rack thereon, a receptaclesecured thereto, a pinion mounted on said-vehicle and engaging said rack, a worm for driving said pinion, an arm, having its respective ends pivoted to the receptacle' and the vehicle, a worm gear having its axis in alignment with thepivotal mounting of said armon the vehicle, the arm and worm gear having a connection therebeevices operable incident to sliding of slide and tilt the receptacle relatively to the vehicle to discharge said receptacle, and

means to rotate the-receptacle to mixl itscontents While said receptacle is being slid and tilted as above described. l

f, In testimony whereof I aix my signature.

` i JOHN F. ROBB.

tween, a worm for driving said worm gear, Y

the worm being driven `from said pinion and means for driving the pinion.

8. In atruck mixer of the class described, the combination with a vehicle, aA mixing drum thereon for the reception of aggregates, the drum being tiltable'and rotatable for the 'discharge of said aggregates, and means for l rotating the drum` to mix the aggregates, of

driving devices for said means, said devices transmitting motion from the vehicle directly to the end of the receptacle which is raised and rotated during discharge of the aggregates,

9. A truck `mixer of the class described, comprlsing, 1n comb1nat1on,'a vehlcle, a receptacle thereon, means for tilting the receptacle, said means including an arm, the respective `ends of which are pivotedto the vVehicle and the receptacle, and means formixing the contents of said receptacle, said means including a gear mounted in alignment with each of the pivotal points of said arm, whereby said rmeans is operative during-tilt-` ing of said receptacle. y

10. A truck mixer of the class described, comrpising, in combination, a vehicle, a receptacle thereon, means for tilting the `receptacle, said means including an arm pivatally connected at one end to the vehicle and at4 the other end to the receptacle, motor means for turning the receptacle mounted on the vehicle, and operating connections between the motor means and the receptacle for rotation of the latter, including driving parts coaxial with ther pivotal connections at the ends of said arm.

11. A truck mixer of the class described,

, comprising, in combination, a vehicle, a receptacle mounted thereon and having a discharge opening, means to simultaneously 

